<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8">
    <title>在线尝试 Bootstrap 实例</title>
    <meta name="viewport" content="width=device-width,
                                     initial-scale=1.0,
                                     maximum-scale=1.0,
                                     user-scalable=no">

    <link rel="stylesheet" href="css/bootstrap.css">
    <script src="js/jquery-3.2.1.js"></script>
    <script src="js/bootstrap.js"></script>
</head>
<body>
<div class="container">



    <div class="btn-group">
        <button type="button" class="btn btn-default dropdown-toggle"
                data-toggle="dropdown">
            默认 <span class="caret"></span>
        </button>
        <ul class="dropdown-menu" role="menu">
            <li><a href="#">功能</a></li>
            <li><a href="#">另一个功能</a></li>
            <li><a href="#">其他</a></li>
            <li class="divider"></li>
            <li><a href="#">分离的链接</a></li>
        </ul>
    </div>
    <div class="btn-group">
        <button type="button" class="btn btn-primary dropdown-toggle" data-toggle="dropdown">原始
            <span class="caret"></span>
        </button>
        <ul class="dropdown-menu" role="menu">
            <li><a href="#">功能</a></li>
            <li><a href="#">另一个功能</a></li>
            <li><a href="#">其他</a></li>
            <li class="divider"></li>
            <li><a href="#">分离的链接</a></li>
        </ul>
    </div>




</div>
</body>
</html>